IPK Creator + IPK Feed Generator
version 6.0
latest build (Version 6.0) which has the new architectures.
No Windows, Linux, macOS binaries and just the jar files (You could open them with JRE 8).
For IPK Feed Generator just place your IPK files beside IPKFeedGenerator.jar then run it, it will create "Package"s and "Packages.gz" for you.
Thanks Persian Prince